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UofT-DSI_SQL_Assignment 1 #488

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55 changes: 55 additions & 0 deletions 02_activities/assignments/DC_Cohort/Assignment1_ERD.drawio
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95 changes: 84 additions & 11 deletions 02_activities/assignments/DC_Cohort/assignment1.sql
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Original file line number Diff line number Diff line change
Expand Up @@ -7,7 +7,8 @@
/* 1. Write a query that returns everything in the customer table. */
--QUERY 1


SELECT *
FROM customer;


--END QUERY
Expand All @@ -17,7 +18,10 @@
sorted by customer_last_name, then customer_first_ name. */
--QUERY 2


SELECT *
FROM customer
ORDER BY customer_last_name, customer_first_name
LIMIT 10;


--END QUERY
Expand All @@ -28,7 +32,10 @@ sorted by customer_last_name, then customer_first_ name. */
Limit to 25 rows of output. */
--QUERY 3


SELECT *
FROM customer_purchases
WHERE product_id IN (4, 9)
LIMIT 25;


--END QUERY
Expand All @@ -43,7 +50,11 @@ Limit to 25 rows of output.
*/
--QUERY 4


SELECT *,
quantity * cost_per_quantity AS price
FROM customer_purchases
WHERE customer_id BETWEEN 8 AND 10
LIMIT 25;


--END QUERY
Expand All @@ -56,7 +67,13 @@ columns and add a column called prod_qty_type_condensed that displays the word
if the product_qty_type is “unit,” and otherwise displays the word “bulk.” */
--QUERY 5


SELECT product_id,
product_name,
CASE
WHEN product_qty_type = 'unit' THEN 'unit'
ELSE 'bulk'
END AS prod_qty_type_condensed
FROM product;


--END QUERY
Expand All @@ -66,7 +83,17 @@ if the product_qty_type is “unit,” and otherwise displays the word “bulk.
add a column to the previous query called pepper_flag that outputs a 1 if the product_name
contains the word “pepper” (regardless of capitalization), and otherwise outputs 0. */
--QUERY 6

SELECT product_id,
product_name,
CASE
WHEN product_qty_type = 'unit' THEN 'unit'
ELSE 'bulk'
END AS prod_qty_type_condensed,
CASE
WHEN LOWER(product_name) LIKE '%pepper%' THEN 1
ELSE 0
END AS pepper_flag
FROM product;



Expand All @@ -79,6 +106,12 @@ vendor_id field they both have in common, and sorts the result by market_date, t
Limit to 24 rows of output. */
--QUERY 7

SELECT *
FROM vendor
INNER JOIN vendor_booth_assignments
ON vendor.vendor_id = vendor_booth_assignments.vendor_id
ORDER BY market_date, vendor_name
LIMIT 24;



Expand All @@ -92,7 +125,10 @@ Limit to 24 rows of output. */
/* 1. Write a query that determines how many times each vendor has rented a booth
at the farmer’s market by counting the vendor booth assignments per vendor_id. */
--QUERY 8

SELECT vendor_id,
COUNT(*) AS booth_rentals
FROM vendor_booth_assignments
GROUP BY vendor_id;



Expand All @@ -106,7 +142,18 @@ of customers for them to give stickers to, sorted by last name, then first name.
HINT: This query requires you to join two tables, use an aggregate function, and use the HAVING keyword. */
--QUERY 9


SELECT customer.customer_id,
customer_first_name,
customer_last_name,
SUM(quantity * cost_per_quantity) AS total_spent
FROM customer
INNER JOIN customer_purchases
ON customer.customer_id = customer_purchases.customer_id
GROUP BY customer.customer_id,
customer_first_name,
customer_last_name
HAVING SUM(quantity * cost_per_quantity) > 2000
ORDER BY customer_last_name, customer_first_name;


--END QUERY
Expand All @@ -124,7 +171,24 @@ When inserting the new vendor, you need to appropriately align the columns to be
VALUES(col1,col2,col3,col4,col5)
*/
--QUERY 10

CREATE TEMP TABLE new_vendor AS
SELECT *
FROM vendor;

INSERT INTO new_vendor (
vendor_id,
vendor_name,
vendor_type,
vendor_owner_first_name,
vendor_owner_last_name
)
VALUES (
10,
'Thomass Superfood Store',
'Fresh Focused',
'Thomas',
'Rosenthal'
);



Expand All @@ -138,7 +202,11 @@ HINT: you might need to search for strfrtime modifers sqlite on the web to know
and year are!
Limit to 25 rows of output. */
--QUERY 11

SELECT customer_id,
strftime('%m', market_date) AS month,
strftime('%Y', market_date) AS year
FROM customer_purchases
LIMIT 25;



Expand All @@ -152,7 +220,12 @@ HINTS: you will need to AGGREGATE, GROUP BY, and filter...
but remember, STRFTIME returns a STRING for your WHERE statement...
AND be sure you remove the LIMIT from the previous query before aggregating!! */
--QUERY 12

SELECT customer_id,
SUM(quantity * cost_per_quantity) AS total_spent
FROM customer_purchases
WHERE strftime('%m', market_date) = '04'
AND strftime('%Y', market_date) = '2022'
GROUP BY customer_id;



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